An instrument that measures the degree to which a substance has been decolorized or has lost its color.
From decolorize + -meter (from Greek metron, meaning 'measure'). This is a technical term combining the decolorize root with scientific measurement terminology, following the pattern of colorimeter (which measures color intensity).
Scientists use these instruments in food processing and water treatment to ensure that bleaching or purification processes work properly—it's basically a color-loss detector that helps manufacturers maintain quality control standards.
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